d2/render_parse.h

   1 // Copyright 2004 David Hilvert <dhilvert@auricle.dyndns.org>,
   2 //                                    <dhilvert@ugcs.caltech.edu>
   3
   4 /*  This file is part of the Anti-Lamenessing Engine.
   5
   6     The Anti-Lamenessing Engine is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     The Anti-Lamenessing Engine is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with the Anti-Lamenessing Engine; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19 */
  20
  21 #ifndef __render_parse_h__
  22 #define __render_parse_h__
  23
  24 #include "render.h"
  25 #include "render/combine.h"
  26 #include "render/invariant.h"
  27 #include "render/incremental.h"
  28 #include "render/zero.h"
  29
  30 /*
  31  * Parse strings describing renderers, and return a renderer satisfying
  32  * the string.
  33  */
  34
  35 class render_parse {
  36 private:
  37         static int strpfix(const char *a, const char *b) {
  38                 return strncmp(a, b, strlen(a));
  39         }
  40
  41         static void nomem() {
  42                 fprintf(stderr, "\n\n*** Error: unable to allocate memory in render_parse. ***\n\n");
  43                 exit(1);
  44         }
  45
  46         static void syntax_error(char *explanation) {
  47                 fprintf(stderr, "\n\n*** Error: Render syntax: %s ***\n\n", explanation);
  48                 exit(1);
  49         }
  50
  51         static filter::filter *get_SF_atomic(const char *type) {
  52                 double param;
  53
  54                 if (!strcmp("sinc", type)) {
  55                         return new filter::sinc();
  56                 } else if (!strpfix("lanc:", type)) {
  57                         if (sscanf(type + strlen("lanc:"), "%lf", &param) != 1)
  58                                 syntax_error("Unable to get lanczos diameter.");
  59                         return new filter::lanczos(param/2);
  60                 } else if (!strpfix("triangle:", type)) {
  61                         if (sscanf(type + strlen("triangle:"), "%lf", &param) != 1)
  62                                 syntax_error("Unable to get triangle diameter.");
  63                         return new filter::triangle(param/2);
  64                 } else if (!strpfix("box:", type)) {
  65                         if (sscanf(type + strlen("box:"), "%lf", &param) != 1)
  66                                 syntax_error("Unable to get box diameter.");
  67                         return new filter::box(param/2);
  68                 } else if (!strpfix("zero", type)) {
  69                         return new filter::zero();
  70                 } else {
  71                         fprintf(stderr, "get_SF_atomic type %s\n", type);
  72                         syntax_error("Unable to get filter.");
  73                 }
  74
  75                 assert (0);
  76
  77                 /*
  78                  * This line should never be reached; it's included to avoid
  79                  * 'unreachable' messages emitted by some compilers.
  80                  */
  81
  82                 return NULL;
  83         }
  84
  85         static filter::filter *get_SF(const char *orig_type) {
  86                 char *type = strdup(orig_type);
  87                 if (type == NULL)
  88                         nomem();
  89
  90                 char *star_index = (char *) type;
  91                 while (*star_index != '\0'
  92                     && *star_index != '*')
  93                         star_index++;
  94
  95                 if (*star_index == '\0') {
  96                         free(type);
  97                         return get_SF_atomic(orig_type);
  98                 }
  99
 100                 *star_index = '\0';
 101                 filter::filter *result = new filter::mult(
 102                         get_SF_atomic(type),
 103                         get_SF(star_index + 1));
 104                 *star_index = '*';
 105                 free(type);
 106                 return result;
 107         }
 108
 109 public:
 110         static filter::scaled_filter *get_SSF(const char *type) {
 111                 if (!strpfix("coarse:", type)) {
 112                         return new filter::scaled_filter(get_SF(type + strlen("coarse:")), 1);
 113                 } else if (!strpfix("fine:", type)) {
 114                         return new filter::scaled_filter(get_SF(type + strlen("fine:")), 0);
 115                 } else {
 116                         return new filter::scaled_filter(get_SF(type), 1);
 117                 }
 118         }
 119
 120         static filter::ssfe *get_SSFE(const char *type) {
 121                 if (!strpfix("ex:", type)) {
 122                         return new filter::ssfe(get_SSF(type + strlen("ex:")), 1);
 123                 } else if (!strpfix("nex:", type)) {
 124                         return new filter::ssfe(get_SSF(type + strlen("nex:")), 0);
 125                 } else {
 126                         return new filter::ssfe(get_SSF(type), 1);
 127                 }
 128         }
 129
 130         static render *get_invariant(const char *type) {
 131                 invariant *i;
 132                 if (!strpfix("min:", type)) {
 133                         i = new invariant(get_SSFE(type + strlen("min:")));
 134                         i->set_min();
 135                 } else if (!strpfix("max:", type)) {
 136                         i = new invariant(get_SSFE(type + strlen("max:")));
 137                         i->set_max();
 138                 } else if (!strpfix("last:", type)) {
 139                         i = new invariant(get_SSFE(type + strlen("last:")));
 140                         i->set_last();
 141                 } else if (!strpfix("first:", type)) {
 142                         i = new invariant(get_SSFE(type + strlen("first:")));
 143                         i->set_first();
 144                 } else if (!strpfix("avg:", type)) {
 145                         i = new invariant(get_SSFE(type + strlen("avg:")));
 146                         i->set_avg();
 147                 } else if (!strpfix("median:", type)) {
 148                         i = new invariant(get_SSFE(type + strlen("median:")));
 149                         i->set_median();
 150                 } else {
 151                         i = new invariant(get_SSFE(type));
 152                         i->set_avg();
 153                 }
 154
 155                 for (int index = 0; index < render::render_count(); index++)
 156                 if  (typeid(*render::render_num(index)) == typeid(incremental)
 157                          && i->equals(((incremental *)render::render_num(index))->get_invariant())) {
 158                                 delete i;
 159                                 return (incremental *)render::render_num(index);
 160                 } else if (typeid(*i->ssfe()->get_scaled_filter()->get_filter()) == typeid(filter::zero)) {
 161                         return new zero(i);
 162                 }
 163
 164                 // fprintf(stderr, "  new '%s'.\n", type);
 165
 166                 return new incremental(i);
 167         }
 168
 169         static render *get_combination(const char *ptype, const char *dtype) {
 170                 render *partial = get_invariant(ptype);
 171                 render *_default = get(dtype);
 172                 for (int index = 0; index < render::render_count(); index++)
 173                 if  (typeid(*render::render_num(index)) == typeid(combine)
 174                          && _default == ((combine *)render::render_num(index))->get_default()
 175                          && partial  == ((combine *)render::render_num(index))->get_partial()) {
 176                                 return render::render_num(index);
 177                 }
 178
 179                 // fprintf(stderr, "  new '%s,%s'.\n", ptype, dtype);
 180
 181                 return new combine(_default, partial);
 182         }
 183
 184         static render *get(const char *orig_type) {
 185                 char *type = strdup(orig_type);
 186                 if (type == NULL)
 187                         nomem();
 188
 189                 char *comma_index = (char *) type;
 190                 while (*comma_index != '\0'
 191                     && *comma_index != ',')
 192                         comma_index++;
 193
 194                 if (*comma_index == '\0') {
 195                         free(type);
 196                         return get_invariant(orig_type);
 197                 }
 198
 199                 *comma_index = '\0';
 200                 render *result = get_combination(type, comma_index + 1);
 201                 *comma_index = ',';
 202
 203                 free(type);
 204                 return result;
 205         }
 206
 207 };
 208
 209 #endif